On the Performance of Porous Sound Absorbent Ceramic Lining in a Combustion Chamber Test Rig

Ries, Hans-Christoph; Carlesso, Mateus; Eigenbrod, Christian; Kroll, Stephen; Rezwan, Kurosch

doi:10.1115/gt2013-95492

Cited by 4 publications

(1 citation statement)

References 8 publications

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“…Tunnels constructed of interlocking building blocks have been shown to have higher energy absorption capacity than standard construction methods [33]. Thermoacoustic instabilities in combustion chambers have also been mitigated with the energy absorption properties of TIM construction [34]. Further motivation is derived from the already mentioned study of interlocking seed wall structures [11].…”

Section: Introductionmentioning

confidence: 99%

Mechanics of Tubes Composed of Interlocking Building Blocks

Mahoney¹,

Siegmund²

2022

Preprint

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Topologically interlocking material (TIM) systems are composed of convex polyhedral units placed such that building blocks restrict each other's movement. Here, TIM tubes are considered as rolled monolayers of such assemblies. The deformation response of these assembled tubes under diametrical loading is considered. This investigation employs experiments on additivelymanufactured physical realizations and finite element analysis with contact interactions. The internal load transfer in topologically interlocking tubes is rationalized through inspection of the distribution of minimum principalstress. A thrust-line (TL) model for the deformation of topologically interlocking tubes is established. The model approximates the deformation response of the assembled tubes as the response of a collection of Misestrusses aligned with paths of maximum load transfer in the system. The predictions obtained with the TL-model are in good agreement with results of finite element models. Accounting for sliding between building blocks in theTL-model yields a predicted response more similar to experimental results with additively manufactured tubes.

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Section: Introductionmentioning

confidence: 99%

Mechanics of Tubes Composed of Interlocking Building Blocks

Mahoney¹,

Siegmund²

2022

Preprint

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Topological Interlocking Materials

Dyskin

Estrin

Pasternak

2019

Architectured Materials in Nature and Engineering

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Tailored directional porosity in ceramic matrix composites (CMCs) for hypersonic applications

Kessel,

Friess,

Rauh

et al. 2024

CEAS Space J

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In the field of hypersonic systems and their missions, the occurring flows impose extreme mechanical and thermal loads on the materials used. At the German Aerospace Center (DLR), extensive research is conducted in this area, ranging from design and specification to the development of suitable materials concluding with the proof of concept under realistic conditions in wind tunnels. In recent years, ceramic matrix composites (CMCs) have been investigated for specific aspects of hypersonics. These materials exhibit consistent mechanical behavior over a wide temperature range (up to 1600 °C), coupled with high damage tolerance and thermal shock resistance, distinguishing them from metals and superalloys. Particularly, special porous C/C–SiC ceramics (carbon-fiber-reinforced carbon with silicon carbide) enable innovative material applications for components in transpiration cooling, fuel injection, or boundary-layer transition control. The work presented focuses on the next generation of porous C/C–SiC ceramics currently in development. By deliberately modifying the textile preform, the resulting microstructure and pore morphology are influenced, allowing for control over both the total volume and the orientation of the pores. Relevant parameters influencing porosity have been determined based on the results, and an initial characterization has been conducted. It has been demonstrated that there is a preferred direction of porosity within the sample thickness (Z-axis), and in terms of hypersonic-relevant properties, an absorption coefficient of 0.58 for an acoustic wave at 500 kHz (static pressure of 15 kPa), as well as a length-specific flow resistance of 3.4 MPa s/m2 and an overall porosity of 12.25% were determined. Building upon these promising initial findings, the goal is to further expand the understanding of the parameters influencing porosity and to generate a tailored material for different application scenarios by correlating them with hypersonic properties.

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On the Performance of Porous Sound Absorbent Ceramic Lining in a Combustion Chamber Test Rig

Cited by 4 publications

References 8 publications

Mechanics of Tubes Composed of Interlocking Building Blocks

Mechanics of Tubes Composed of Interlocking Building Blocks

Topological Interlocking Materials

Tailored directional porosity in ceramic matrix composites (CMCs) for hypersonic applications

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